Optimisation of flue gas cleaning processes by utilisation of the Performance profile of PTFE and modified PTFE in heat exchanger and lining applications

摘要

Increasing focus on environmental aspects of coal fired power plants gives the flue gas cleaning processes more importance from year to year. Different kind of equipment installed downstream of the boiler ensure the fulfillment of new environmental regulations. The precipitation of the particles within the electrostatic precipitator (ESP) and the reduction of SO_2 in the flue gas desulfurisation unit (FGD) can be considered as standards. Chemical processes such as selective catalytic reduction (SCR) and selective non-catalytic reduction (SNCR) reduce the NO_x emissions significantly in many power plants. New carbon capture systems to minimise the CO_2 content in the exhaust gases, the main product of the combustion process, are presently under development. While coal-fired power plants in general are designed for continuous energy production under full capacity utilisation, due to the fluctuating feed of energy from wind and sun into the energy distribution systems, the coal-fired power plants have to compensate by changing the utilisation coefficient permanently. This generates additional requirements especially for corrosion protection, as the conditions are changing from wet to dry depending on plant utilisation. Finally, during short- or long-term shut down periods, additional precautions for preservation have to be undertaken.